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Int J Adolesc Med Health. 2011 May 18;3(2):101-20. doi: 10.1515/IJAMH.1987.3.2.101.
Fertility awareness/natural family planning for adolescents and their families: report of multisite pilot project.
Klaus H, Bryan LM, Bryant ML, Fagan MU, Harrigan MB, Kearns F
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